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LM3445MM 데이터시트(PDF) 1 Page - Texas Instruments

부품명 LM3445MM
상세설명  TRIAC Dimmable Offline LED Driver
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ICOLL
V+
BR1
VAC
TRIAC
DIMMER
+
+
1
2
3
4
5
6
7
8
9
10
-
VLED
GND
VCC
FLTR2
ASNS
FLTR1
ISNS
GATE
BLDR
COFF
DIM
LM3445MM
VLED-
D3
C7
C9
C10
D4
D8
D9
R2
D1
Q1
C5
R5
C12
D2
D10
Q2
L2
Q3
R3
R4
C11
C4
C3
R1
U1
VBUCK
LINE VOLTAGE (VAC)
95.0
90.0
85.0
80.0
75.0
80
90
100
110
120
130
140
14 Series connected LEDs
10 Series connected LEDs
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Reference
Design
LM3445
SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015
LM3445 TRIAC Dimmable Offline LED Driver
1 Features
3 Description
The LM3445 is an adaptive constant off-time AC/DC
1
TRIAC Dim Decoder Circuit for LED Dimming
buck (step-down) constant current controller designed
Application Voltage Range 80 VAC to 277 VAC
to be compatible with TRIAC dimmers. The LM3445
Capable of Controlling LED Currents Greater
provides a constant current for illuminating high
Than 1 A
power LEDs and includes a TRIAC dim decoder. The
dim decoder allows wide range LED dimming using
Adjustable Switching Frequency
standard
TRIAC
dimmers.
The
high
frequency
Low Quiescent Current
capable architecture allows the use of small external
Adaptive Programmable Off-Time Allows for
passive components. The LM3445 includes a bleeder
Constant Ripple Current
circuit to ensure proper TRIAC operation by allowing
current flow while the line voltage is low to enable
Thermal Shutdown
proper firing of the TRIAC. A passive PFC circuit
No 120-Hz Flicker
ensures good power factor by drawing current directly
Low Profile 10-Pin VSSOP Package or 14-Pin
from the line for most of the cycle, and provides a
SOIC
constant positive voltage to the buck regulator.
Additional features include thermal shutdown, current
Patented Drive Architecture
limit and VCC under-voltage lockout.
2 Applications
Device Information(1)
Retro Fit TRIAC Dimming
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Solid State Lighting
VSSOP (10)
3.00 mm × 3.00 mm
LM3445
Industrial and Commercial Lighting
SOIC (14)
3.91 mm × 8.65 mm
Residential Lighting
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical LM3445 LED Driver Application Circuit
Efficiency vs Line Voltage
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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